TRW pistons L2443N +30

« **on:** May 07, 2009, 08:00:14 PM »

I picked up a short block today with about 200 miles on it.

The pistons, bores etc look like new and it's balanced

. My question is what are the specs on these old slugs?

The guy said they should give me 10:5 CR with my Edelbrock 95CC heads.

They should be from around 1996. The engine was in a,,, ready? Mercury Capri. It was
a sunday driver and he upgraded to a stroker engine. That thing must FLYYYYY. He said it ran high
9's in the quarter. I'm surprised it didn't twist the car in half

Any help on the info will be greatly appreciated.

« **Reply #1 on:** May 07, 2009, 08:13:58 PM »

Exact pistons I'm running Dave, save mine are .040 and I dunno what the 'N" means, but sounds about right. With my heads I'm getting about 11.5 or so to one, from what the machinist told me. (Started out running only 93 octane, but 91 seems ok, no detonation as yet). I really think though with 95cc heads your much closer to 10:1 or less, maybe Paul or Ralph will know more on this.

Ray

Edit: Oh, and they're forged, but you prolly already knew that.

« **Reply #2 on:** May 07, 2009, 08:18:52 PM »

Do you know if the rings the standard size (width) for the ford pistons? With TRW out of business
I'd hate to try to find a set of their rings.

The seller told me he had about 13:1 CR with his cobra jet heads? Do you know what CC dome they have?

I don't know much about the pistons but a balanced short block looking like new.. $300 bucks. I didn't ask many questions. It was torn down so I could check the crank, pistons and cylinders. I'm still
smiling. He was just going to sell the crank, rods and pistons (still on the rods) but I got the block too.

Anyone know if someone took over TRW or did they just die out?
Thanks Ray.

« **Reply #3 on:** May 07, 2009, 08:24:39 PM »

Dunno who, if anyone, bought them out, (hadda be someone), but my pistons were bought brand new 4 months ago from Summit! Standard groove/land size, but we used Speed Pro Moly rings on mine (Loosed up a bit on the gap size given a marine engine).

Ray

« **Reply #4 on:** May 07, 2009, 08:25:56 PM »

I'll call summit in the morning. You're a life saver Ray!

« **Reply #5 on:** May 07, 2009, 08:29:47 PM »

same pistons i have in my liberty except i have the dome milled off.
0-decked block and d3 heads 10.5 to1

« **Reply #6 on:** May 07, 2009, 08:35:38 PM »

Quote

You're a life saver Ray

You've obviously never ridden with me, lol

Ray

« **Reply #7 on:** May 07, 2009, 08:40:39 PM »

Well ok not a life saver but you guys have been a god send when I got in trouble.
I'm the only jet boater in the area, unless you count those lake lice.

With out your help I would really have struggled.

Thank you all!

« **Reply #8 on:** May 07, 2009, 08:44:16 PM »

Quote from: Ralph Brunt on May 07, 2009, 08:29:47 PM

same pistons i have in my liberty except i have the dome milled off.
0-decked block and d3 heads 10.5 to1

Ralph is right in line with my math too. Should be fine with the Eddy heads at less than 10:1 with no milling.

SCJ heads had only something under 35cc I think, could be wrong. Mine are, I beleive, 73cc. Again, Ralph would know more than me, but I can say 91 octane with my 73cc heads with unmilled slugs runs fine on 91 octane. ('tis how I judge compression anyway, no detonation, and no pinging or run on).

So I beleive you're golden, and GREAT FIND, those slugs go for a lot more than that!

Ray

« **Reply #9 on:** May 07, 2009, 08:47:58 PM »

Quote from: electrowoman on May 07, 2009, 08:40:39 PM

Well ok not a life saver but you guys have been a god send when I got in trouble.
I'm the only jet boater in the area, unless you count those lake lice.

With out your help I would really have struggled.

Thank you all!

Still coming back there (youngstown, ohio), for a wedding in October, whatsay I forgoe the plane trip and tow the Moo boat and we hit the Rivers?, lol ( I wanna roost the Fountain at the Point SOOOOOO bad)

Then you'll know what we're all about, comraderie.

Ray

« **Reply #10 on:** May 07, 2009, 08:50:28 PM »

i think your riding the borderline for pump gas

do the math before you install. the only saving grace you have is the aluminum heads, i would not even think about running those with iron heads and pump gas. your tune up will have to be dead on all the time. or you guessed it DETONATION

« **Reply #11 on:** May 07, 2009, 09:01:41 PM »

See? told you, Ralph knows a TON more than me, like an encyclopedia with a slide rule, and off the top of his head!.

My saving grace is the rainbirds I have fueling the thing and the tunnel ram, I think. Cools the charge down a bit. But your heads are 1/3 bigger than mine in CC volume AND aluminum. I would run it, but that's just me. Just make sure you only run premium in it.

I think you'll make big power from that, with the right cam, so be forewarned!

Ray

Wait a minute, just thought of this, Ralph, does the N mean something different than mine are?

« **Reply #12 on:** May 07, 2009, 09:39:42 PM »

I think you want the "N" facing north when you install them....

« **Reply #13 on:** May 07, 2009, 10:00:01 PM »

North it shall be my friends

HP is addictive isn't it.

Oh I forgot, Ralph what do you think the CR will be? The block is decked
(no info on what they cut) the heads are 95CC stock stroke.

I have no clue on the dome and that stops me dead in my tracks. I could only go by what
the seller told me. 10:5

« **Reply #14 on:** May 07, 2009, 11:31:15 PM »

Quote from: HDriderTH on May 07, 2009, 09:39:42 PM

I think you want the "N" facing north when you install them....

What took you so long Terry? lol

Ray

« **Reply #15 on:** May 08, 2009, 06:52:05 AM »

thanks for the kind words guys

i think the cr is going to be around 11-4 to1

« **Reply #16 on:** May 08, 2009, 06:56:40 AM »

That's steeper than I thought. Do you think I'll be ok with the aluminum heads on pump gas?
I'm not interested in racing fuel...

Do you guys know where I might find the factory info for these pistons? Specifically the dome size

I can't find anything about them. What does the N mean?

I just checked summit for these since Rebal got his there. The number is the same but they
added an F at the rear. I wonder if they are the same. According to their specs it's 10.55 CR
with a 92cc chamber.

« **Reply #17 on:** May 08, 2009, 09:19:22 AM »

That's kinda why I questioned the N. Mine had no letter at all that I recall. Not gonna pull the heads to find out either, lol. Could just be the die number used to forge them?? damifiknow.

An F at the rear means they're Omars' pistons.

Ray

« **Reply #18 on:** May 08, 2009, 09:44:39 AM »

Email these guys with your info

http://www.flatlanderracing.com/home.html

I looked through their list of pistons and I'm pretty sure they arent available anymore but they might still have the info on them.

-beerjet-

« **Reply #19 on:** May 08, 2009, 09:57:42 AM »

Quote from: IRRebel on May 08, 2009, 09:19:22 AM

That's kinda why I questioned the N. Mine had no letter at all that I recall. Not gonna pull the heads to find out either, lol. Could just be the die number used to forge them?? damifiknow.

An F at the rear means they're Omars' pistons.

Ray

Lettering at the end of the part numer.
"F" denotes a "flat top" piston

Ray........
"D" denotes "dish" type piston
"L" at the front of the part number denotes a forged piston
Couldnt figure out for the life of me what the "N" at the end means

-beerjet-

« **Reply #20 on:** May 08, 2009, 10:11:47 AM »

Wow, knew you knew everything about boat hulls, etc, but pistons too? You never cease to amaze me Omar

Now I need Tommy's SWAT probe cam to see exactly what I put in there. Was supposed to be 10.5:1 with my heads before the milling and shoulda come up at around 10.7 or so to 1. Still high, but useable.

Still not at 11.5 or so, else it'd say Ping more often than the Chinese phone book.

Ray

« **Reply #21 on:** May 08, 2009, 05:44:36 PM »

I sent off an email to Flatlander racing. I'll let you know if I hear from them.
Thanks for the imput guys

« **Reply #22 on:** May 08, 2009, 06:12:54 PM »

look here
http://www.brcperformance.com/enginecalc.htm

« **Reply #23 on:** May 08, 2009, 07:34:00 PM »

Quote from: electrowoman on May 07, 2009, 08:00:14 PM

I picked up a short block today with about 200 miles on it. The pistons, bores etc look like new and it's balanced . My question is what are the specs on these old slugs?

The guy said they should give me 10:5 CR with my Edelbrock 95CC heads.

They should be from around 1996.

Any help on the info will be greatly appreciated.

TRW got out of the piston biz in 1996. They sold the tooling to Federal Mogul, who now offers the TRW line under their Speed-Pro piston line. So today, these TRW L2443 pistons are sold as Speed Pro L2443 pistons.

But between 1995 and today, there have been several revisions to the L2443 piston design by Federal Mogul (one of which I instigated), and the L2443 piston that Speed Pro offers today will not directly match the pistons in the shortblock that you purchased. But there can be situations where the newest revision might be used with the older design piston that you have.

Changes over the years include: shortening the skirt tang; changing the wrist pin clip groove design (and the clip that is used); overall configuration & finish, possibly the valve pocket depth, possibly the dome volume, to name a few.

There are a lot of variables to consider when determining compresison ratio, including which L2443's you have, as well as chamber volume, deck height, etc. Based on the info you provided in this thread, I'd guess you are well over 11:1 and possibly approaching 11.5:1 compression ratio.

LO

« **Reply #24 on:** May 08, 2009, 07:41:55 PM »

And Paul, do you know what the "N" means"? we're dying to know.

Ray

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